It can be fun if they put some work into it. For example, let the branching paths be "Professional Dentist" and "Mischievous Dentist" with both requiring logic but the latter also Mischief. Let it be an active career where you have to interact with your patients and build a dental office that calms your patients with good music and decor. Or be a mischievous dentist and build a terrible office that puts your patients tense. If you're on the mischievous side you would have interactions like using antiquated tools and exaggerating how painful things are to traumatize Sims... It would integrate with reputation and give you a negative one, and if you reach the maximum level of the career, other Sims will get a Tense moodlet near you (even outside work) and lose their appetite (hunger need fills up a bit).
Okay maybe I got a bit carried away :P
